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I agree 100%. If there is a solid backlink in relevant content that has been paid for there is no possible way for ANY SE to ever know it was a monetarily influenced link.
They can't monitor things like that, there is just no way. People link to each other, and some people pay to link to their sites. It happens.

You know, I am very surprised anyone thinks social networking is useless. There are so many uses depending on your business model. It drives me nuts when people don't think a little outside the box.
However digg I have found to be ... well yeah worthless.